CN114846247A - Axial fan with opening on hub - Google Patents

Axial fan with opening on hub Download PDF

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Publication number
CN114846247A
CN114846247A CN202180007636.7A CN202180007636A CN114846247A CN 114846247 A CN114846247 A CN 114846247A CN 202180007636 A CN202180007636 A CN 202180007636A CN 114846247 A CN114846247 A CN 114846247A
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CN
China
Prior art keywords
fan
hub
axial fan
side wall
fan hub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202180007636.7A
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Chinese (zh)
Other versions
CN114846247B (en
Inventor
托马斯·奥伊勒罗勒
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tuo MasiAoyileluole
Original Assignee
Tuo MasiAoyileluole
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Publication of CN114846247A publication Critical patent/CN114846247A/en
Application granted granted Critical
Publication of CN114846247B publication Critical patent/CN114846247B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/329—Details of the hub
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/706—Humidity separation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/602—Drainage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/605—Venting into the ambient atmosphere or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/607—Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The present invention relates to an axial fan (1) comprising: -a fan hub (2) rotatable about a centre axis (3) and having a bottom wall (5) and an annular circumferential side wall (6), -a plurality of fan blades (7) protruding from the annular circumferential side wall (6) of the fan hub (2), -wherein the fan hub (2) has a plurality of outlet openings (8) for discharging gas, liquid and/or solid accumulations from the interior (2a) of the fan hub (2) to the exterior of the fan hub (2), wherein-the plurality of passage openings (8) is provided on the annular circumferential side wall (6) of the fan hub (2).

Description

Axial fan with opening on hub
Technical Field
The present invention relates to an axial fan, comprising:
a fan hub rotatable about a central axis and comprising a bottom wall and an annular circumferential side wall,
a plurality of fan blades projecting from an annular circumferential side wall of the fan hub,
-wherein the fan hub comprises a plurality of outlet openings for discharging gas, liquid and/or solid accumulations from the interior of the fan hub to the exterior of the fan hub.
Background
Such an axial fan is known from EP 1718872B 1. In this prior art, a cup-shaped hub having a bottom and an annular sidewall is provided. The inner side of the hub is provided with a rib. In order to remove sediment, such as water, sand, soil or sludge, from the cavity of the hub, the hub comprises a passage opening at the bottom. The passage openings are located in the corner regions of the hub bottom formed by the side walls and the inner ribs. In use, centrifugal forces push the deposits along the ribs into the corner regions and from there through the passage openings to the outside. Thus, the side walls and the respective ribs form a double barrier, intended to facilitate the removal of the deposits.
However, in practice, it has been shown that removing deposits from the hub interior does not always work reliably. Deposits can accumulate at the corners within the hub. Furthermore, the centrifugal forces for removing the fouling deposits are not fully utilized. Furthermore, there is a need to improve the air throughput, especially if the axial fan is operated in both rotational directions.
Other devices are known from EP 2085618 a2, EP 0521285 and US 2011/280729 a 1.
Disclosure of Invention
It is therefore an object of the present invention to mitigate or obviate at least some of the disadvantages of the prior art. In particular, the invention sets out the object of improving the removal of accumulations from the interior of the fan hub.
This object is achieved by an axial fan having the features of claim 1. Preferred embodiments are specified in the dependent claims.
According to the invention, a plurality of outlet openings are provided on the annular circumferential side wall of the fan hub.
Surprisingly, it has been found that accumulations inside the fan hub on the motor side, such as moisture or dirt and gases, can be removed particularly well through the outlet openings in the annular circumferential side wall. In the rotating state of the axial fan, the accumulations are conveyed outwards by centrifugal force and discharged in the direction of the centrifugal force through outlet openings in the annular circumferential side wall, i.e. in particular the sleeve-shaped side wall. Flow conditions for removing buildup have proven to be particularly advantageous at the sidewalls. Furthermore, the operation of the axial fan in both rotational directions can be achieved with good air throughput.
Preferably, the outlet opening is spaced from both annular side edges of the sidewall such that the outlet opening is located entirely within the sidewall of the fan hub. In a preferred embodiment, the bottom wall does not have a passage opening for accumulations from the inside of the fan hub. However, the bottom wall may comprise a penetration for the motor shaft. In the assembled state, the motor shaft is arranged in a substantially exact fit in the penetration preferably in the center of the bottom wall.
In a preferred embodiment, each fan blade is provided with at least one outlet opening in the annular sidewall of the fan hub. In this way, residues inside the fan hub can be reliably removed. Preferably, the outlet openings are arranged at regular intervals on the side wall of the fan hub, so that a uniform removal over the circumference of the fan hub is achieved.
To achieve efficient extraction of the buildup from the fan hub, in another embodiment, the outlet opening is directly adjacent the fan blades. In this embodiment, the air flow is guided along the fan blades after passing through the outlet opening, so that a particularly effective removal of accumulations is achieved.
In another embodiment, it is advantageous if one outlet opening is provided on each of the opposite outer sides of the fan blade. Thus, two outlet openings may be provided per fan blade. This embodiment is particularly advantageous in that the fan can operate efficiently in both rotational directions.
The outlet opening may be realized as a slot.
To further improve the suction from the inside of the fan hub, a bulge protruding from the annular side wall may be provided beside the outlet opening. Comprehensive investigations have shown that these ridges increase the airflow through the outlet opening, thereby improving the ability to remove build-up from the fan hub.
In one embodiment variant, the bulge is raised towards the outlet opening, so that the bulge is in the form of a ramp.
Depending on the embodiment, each bulge may comprise a substantially constant slope or a slope increasing towards the respective outlet opening.
If the fan hub has a plurality of sector elements interconnected by interlocking connection elements, the axial fan can be easily disassembled and reassembled.
The strip-shaped elements and the recesses may be provided as interlocking connecting elements. The strip-shaped elements and the recesses have corresponding cross sections. Thus a self-locking connection is achieved. For example, the strip-shaped elements and the recesses may each be formed with a circular cross-section.
In order to establish a secure and durable connection, in a preferred embodiment the interlocking connection elements extend substantially over the entire height of the annular side wall.
According to an embodiment, at least four, in particular at least six, sector elements may be provided, for example eight sector elements. Preferably, each sector element comprises exactly one fan blade. The sector elements together form a fan hub having an annular circumferential side wall. Each sector element therefore has an opening angle substantially corresponding to the ratio of 360 degrees to the number of sector elements. For example, for eight sector elements, the sector elements have an opening angle of 45 degrees.
In order to direct the air flow to the outlet opening on the annular side wall of the fan hub, in a preferred embodiment the fan hub comprises ribs on the inside of the bottom wall. Reinforcing ribs extending to the inside of the side walls may be provided. Furthermore, air guide ribs may be provided between the reinforcing ribs, which preferably terminate at a distance from the side walls.
For operation of the axial fan, the shaft of the motor may be connected to the fan hub. The shaft extends through the interior of the fan hub to a penetration provided in the center of the bottom wall. The motor may be an electric motor, in particular a "brushless" motor.
Drawings
The invention is further explained below with reference to two exemplary embodiments shown in the drawings.
Fig. 1 shows a top view of an axial fan according to the present invention.
Fig. 2 shows a perspective view of the axial flow fan of fig. 1.
Fig. 3 shows a view of the axial fan of fig. 1, 2 in an exploded state of the individual sector elements of the axial fan.
Fig. 4 shows a side view of the axial flow fan of fig. 1 to 3.
Fig. 5 shows detail a of fig. 2 in an enlarged view.
Fig. 6 shows detail B of fig. 4 in an enlarged view.
Fig. 7 and 8 show perspective views of a single sector element of the axial fan of fig. 1 to 4.
Figure 9 shows a rear view of the sector element of figures 7 and 8.
Figure 10 shows a side view of the sector element of figures 7 to 9.
Fig. 11 shows detail C of fig. 7 in an enlarged view.
Fig. 12 shows detail D of fig. 7 in an enlarged view.
Fig. 13 shows detail E of fig. 8 in an enlarged view.
Fig. 14 shows detail F of fig. 8 in an enlarged view.
Fig. 15 shows detail G of fig. 9 in an enlarged view.
Fig. 16 shows detail H of fig. 9 in an enlarged view.
Fig. 17 shows a top view of another axial fan according to the present invention.
Fig. 18 shows a rear view of the axial flow fan of fig. 17.
Fig. 19 shows a schematic view of the axial flow fan of fig. 17 and 18.
Fig. 20 shows detail I of fig. 20 in an enlarged view.
Fig. 21 shows a cross section along the line XXI-XXI in fig. 17.
Fig. 22 shows detail J of fig. 21 in an enlarged view.
Fig. 23 shows detail K of fig. 19 in an enlarged view.
Detailed Description
Fig. 1 shows an axial fan 1 with a fan hub 2, which fan hub 2 rotates about a central axis 3 (see fig. 4). In the illustrated embodiment, the axial fan can operate efficiently in both rotational directions. The direction of rotation is exemplarily indicated by an arrow. The fan hub 2 has a lead-through 4 for the shaft of an electric motor (not shown). The fan hub 2 has a bottom wall 5 which is circular in plan view and a side wall 6 which is sleeve-shaped. The bottom wall 5 is arranged substantially perpendicular to the central axis 3. The side walls 6 extend axially symmetrically with respect to the central axis 3. Thus, the fan hub 2 is cup-shaped, the bottom wall 5 and the side wall 6 defining an interior 2 a. The motor may be at least partially disposed within the interior 2 a. The axial fan 1 also has a plurality of fan blades or fan blades 7, eight fan blades 7 in the example shown, which project radially outwards from the side wall 6 of the fan hub 2.
The fan hub 2 has a plurality of outlet openings 8, which outlet openings 8 are arranged to carry gas, liquid and/or solid accumulations generated during operation from the interior 2a of the fan hub 2 to the exterior 2b of the fan hub 2. Such accumulations may be, for example, water, dirt or gases, which may impair the operation of the axial fan 1 if they remain in the interior 2 a. In the embodiment shown, the passage opening 8 is formed on the annular circumferential side wall 6 and therefore not on the bottom wall 5. At least one outlet opening 8 is provided for each fan blade 7. In the embodiment shown, two outlet openings 8 are provided on both sides of each fan blade 7. The outlet opening 8 is here formed as a groove. Since the outlet opening 8 in the shown embodiment is directly adjacent to the outside of the fan blade 7, the air flow is guided along the outside of the fan blade 7 through the outlet opening, as indicated by the flow lines 9.
In the exemplary embodiment of fig. 1 to 16, the fan hub 2 is composed of a plurality of sector elements 10, for example eight sector elements 10 in this case. The individual sector elements 10 are connected to each other by interlocking connecting elements 11. The connecting elements 11 can be inserted into each other in the axial direction, i.e. in the direction of the central axis 3. In the embodiment shown, the external connection element 11a is provided on the side wall 6 and the internal connection element 11b is provided on the projection 12, the projection 12 delimiting the penetration 4 for the motor shaft. In the embodiment shown, a strip-shaped element 13 (see in particular fig. 16) and a recess 14 (see in particular fig. 15) are provided as interlocking connecting elements 11 which have a matching cross section, in this case a circular cross section, so that the connecting elements can be connected to one another in a substantially exact fit. The connecting element 11 extends substantially over the entire height of the annular circumferential side wall 6.
As can be seen in particular from fig. 2, the fan hub 2 has a separate rib 15 on the inner side 6a (facing the interior 2a) of the bottom wall 6. For example, one rib 15 may be provided per fan blade 7. Thus, as shown, in the exemplary embodiment shown, eight ribs 15 are provided in the interior 2a of the fan hub 2.
In fig. 17 to 23, another embodiment of the axial flow fan 1 is shown. In this embodiment, the annular side wall 6 of the fan hub 2 is also provided with an outlet opening 8, whereas the bottom wall 5 is free of such outlet openings. Here, the outlet opening 8 is spaced apart from the fan blade 7. Furthermore, next to the outlet opening, a separate (and separate from the fan blades 7) bulge 16 is formed (see in particular fig. 23), the bulge 16 protruding outwards from the outside of the annular circumferential side wall 6. The bulge 23 rises in a ramp-like manner towards the outlet opening 8. In the illustrated embodiment, the protuberances 23 each have a substantially constant slope. However, the slope may also increase in the direction of the adjacent outlet opening 8 (not shown).
As can be seen from fig. 18 and 19, this embodiment also provides ribs 15, wherein the stiffening ribs 15a extend on the one hand to the side walls 6 and between them air guide ribs are arranged, which end in front of the side walls 6.

Claims (13)

1. An axial fan (1) comprising:
-a fan hub (2) rotatable about a central axis (3) and comprising a bottom wall (5) and an annular circumferential side wall (6),
-a plurality of fan blades (7) protruding from the annular circumferential side wall (6) of the fan hub (2),
-wherein the fan hub (2) comprises a plurality of outlet openings (8) for discharging gas, liquid and/or solid accumulations from the interior (2a) of the fan hub (2) to the exterior of the fan hub (2),
it is characterized in that
-the plurality of passage openings (8) are provided on an annular circumferential side wall (6) of the fan hub (2).
2. Axial fan (1) according to claim 1, characterized in that on the annular circumferential side wall (6) of the fan hub (2) at least one outlet opening (8) is provided per fan blade (7).
3. Axial fan (1) according to claim 1 or 2, characterized in that the outlet opening (8) is directly adjacent to the fan blades (7).
4. Axial fan (1) according to any of claims 1 to 3, characterized in that each of the opposite outer sides of the fan blades (7) is provided with an outlet opening (8).
5. The axial fan (1) according to any one of claims 1 to 4, characterized in that beside said outlet opening (8) there is provided a protuberance (23) projecting from said annular circumferential side wall (6).
6. The axial fan (1) according to claim 5, characterized in that said hump (23) is raised towards said outlet opening (8).
7. Axial fan (1) according to claim 6, characterized in that said elevations (23) each comprise a substantially constant slope or a slope increasing towards the respective outlet opening (8).
8. The axial fan (1) according to any one of claims 1 to 7, characterized in that said fan hub (2) comprises a plurality of sector elements (10) mutually connected by interlocking connecting elements (11).
9. Axial fan (1) according to claim 8, characterised in that the strip-shaped element (13) and the recess (14) are provided as interlocking connection elements (11).
10. Axial fan (1) according to claims 8 and 9, characterized in that said interlocking connection element (11) extends substantially over the entire height of said annular circumferential side wall (6).
11. Axial fan (1) according to any of the claims 8 to 10, characterized in that at least four sector elements (10) are provided, in particular at least six sector elements (10), for example eight sector elements (10).
12. The axial fan (1) according to any one of claims 1 to 11, wherein said fan hub (2) comprises ribs (15) on the inside of said bottom wall (5).
13. Axial fan (1) according to any of claims 1 to 12, characterized in that an electric motor is connected with the fan hub (2).
CN202180007636.7A 2020-02-11 2021-02-11 Axial fan with opening on hub Active CN114846247B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ATGM50025/2020U AT17059U1 (en) 2020-02-11 2020-02-11 Axial fan
ATGM50025/2020 2020-02-11
PCT/AT2021/060051 WO2021159161A1 (en) 2020-02-11 2021-02-11 Axial fan with openings in the hub

Publications (2)

Publication Number Publication Date
CN114846247A true CN114846247A (en) 2022-08-02
CN114846247B CN114846247B (en) 2024-07-12

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ID=74661193

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202180007636.7A Active CN114846247B (en) 2020-02-11 2021-02-11 Axial fan with opening on hub

Country Status (5)

Country Link
US (1) US12012970B2 (en)
EP (1) EP4103848A1 (en)
CN (1) CN114846247B (en)
AT (1) AT17059U1 (en)
WO (1) WO2021159161A1 (en)

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CN115539418A (en) * 2022-11-10 2022-12-30 济南七月雨电子信息科技有限公司 High-efficient refrigeration industry fan

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN115539418B (en) * 2022-11-10 2023-08-18 广州市金瑞昌建筑环境工程有限公司 High-efficient refrigeration industry fan

Also Published As

Publication number Publication date
AT17059U1 (en) 2021-04-15
WO2021159161A1 (en) 2021-08-19
US12012970B2 (en) 2024-06-18
EP4103848A1 (en) 2022-12-21
CN114846247B (en) 2024-07-12
US20230104569A1 (en) 2023-04-06

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